Croft



(No Mod'e L) s. RAVENSGRQFT. GASTER WHEEL AND DIE FOR MAKING THE SAME.

110.2%,942. V PatentedApr. 1,1884.

WITNESSES:

ATTORNEYS.

the dies for making the same.

UNITED STATES PATENT OFFICE.

WALTER S. RAVENSOROFT, OF PARKERSBURG, WVEST VIRGINIA.

(EASTER-WHEEL AND o||-: FOR MAKING THE-SAME.

SPECIFICATION forming part of Letters Patent No, 295,942, dated April 1, 1884. Application filed June 7,1883. (No model.)

To all whom it may concern;

Be it known that I, WALTER S. RAVENS- CROFT, of Parkersburg, in the county of Wood and State of W'est Virginia, have invented a new and useful Improvement in Caster- VVheels and Dies for Manufacturing the Same, of which the following is a full, c1ear, and exact description, reference being had to the annexed drawings, forming part of this specification.

My invention relates to the manufacture of caster-wheels from woody fiber, or wood or paper pulp, and also to the construction of In the drawings, Figure 1 is a longitudinal section of my improved dies for manufacturin g caster-wheels from pulp. Fig. 2 is a transverse section of the same, and Fig. 3 is a sectional view of the completed caster.

A indicates a stationary hollow cylinder, in

which are arranged two hollow cylindrical plungers or dies, B B, and D D are solid cylindrical plungers or dies arranged in the said hollow plungers. The plungers D D are made shorter than the plungers B B, in order that they may be given a final independent movement to exert an increased pressure upon the center or hub portion of the caster to make said portion very hard and capable of resisting wear for a longer time. The plungers are to be operated by eccentrics E, mounted on shafts F, which are to be rotated by any suitable power. The eccentrics are so constructed that they will move both plungers B Dor B D uniformly against the pulp in the space G until the caster is of proper thickness at the part pressed between the plungers B B, then as the eccentrics continue to rotate the part H of the eccentrics will force the plunger D or D against the center or hub portion of the caster until such portion is made of. a thickness equal to or nearly equal to that pressed by the plungers. B B. The center or bearing part of the caster is thus made very dense or hard, so that 'it will not readily yield to the frictional wear of the axle.

The cylinderA is to be provided with a suitable opening, through which it may be charged and discharged; or the plungers may be made sufficiently short with respect to the diameter of the eccentrics to allow them to be drawn out of the cylinder by connections to cranks on the shafts carrying the eccentrics, and the cylinder may be charged and discharged at the ends.

If desired, one of the plungers B B, and also one of the plungers D D, may bemade stationary.

I do not restrict myself to the means above described for operating the plungers, but may use other equivalent expedients.

What I claim is 1. The combination of the mold A, having a suitable bottom or diesat one end, the die B, formed in one piece, having a cylindrical bore of uniform diameter, and the die D, fitting said bore and free to move in the same from one end to the other, substantially as specified.

2. The combination of the mold or cylinder A, the dies B B, made free to move toward and from each other, and the dies D D, adapted to move toward and from each other in the dies B B and independently of the latter, sub stantially as shown and described.

3. The caster-wheel formed of woody fiber or any pulp, having its central portion additionally compressed, substantially as and for the purpose specified. I

WALTER S. RAVEN SGROFT. WVitnesses:

WALTER A. LEESE, DANE D. JOHNSON. 

